Cleaning method for high-pressure tubular polyethylene reaction system

• Main Authors: SUN JINGYUAN, WANG JINGDAI, CHEN YUMING, TONG XUEQING, REN CONGJING, FAN XIAOQIANG, LI WEI, YANG YAO, HUANG ZHENGLIANG
• Format: Patent
• Language: Chinese; English
• Published: 22.06.2021
• Subjects: ANIMAL AND VEGETABLE OILS, FATS, FATTY SUBSTANCES AND WAXES; CANDLES; CHEMISTRY; CLEANING; CLEANING IN GENERAL; DETERGENT COMPOSITIONS; DETERGENTS; FATTY ACIDS THEREFROM; METALLURGY; PERFORMING OPERATIONS; PREVENTION OF FOULING IN GENERAL; RECOVERY OF GLYCEROL; RESIN SOAPS; SOAP OR SOAP-MAKING; TRANSPORTING; USE OF SINGLE SUBSTANCES AS DETERGENTS

The invention discloses a cleaning method for a high-pressure tubular polyethylene reaction system. A high-pressure tubular polyethylene production process system is in a supercritical fluid state, a phase separation behavior easily occurs in the state, polyethylene can be separated out under a certain condition to form wall adhesion without a fixed position. The cleaning method is characterized in that a solvent component with the solubility parameter within the range of 7-11cal<1/2>*cm<-3/2> is introduced from an inlet of a high-pressure tubular polyethylene reactor to dissolve wall adhesion substances accumulated in the system, a cleaned mixed solvent component is poured out from an outlet after cleaning, and the process needs to be carried out offline or is combined with pressure fluctuation to form shockwave on-line cleaning so that solubility can be enhanced for shock flow cleaning. According to the cleaning method, the problems that the final property of a product is influenced due to the fact that ope